I got my copy of Inside Out from iTunes today
At the end of the movie, we see several new islands have been added:

Hockey, Honesty, Family, Frendship and Goofball are the ones I could readily identify.
Boy Band Island (hope that's just a phase) is most likely the one with the music stage.
Tragic Vampire Romance might be the one with the the Raven, broken window and books.
Fashion (Disgust's favorite!) is mentioned by name, but not indicated or shown.
The others are Transmission Tower (technological knowledge?), Golden Gate Bridge, World Globe with Science Equipment (probably represents school learning).
What do you think these new islands are?
Another thing I wondered about is the TripleDent memory mailing scene.
The Mindworkers send the memory up to Headquarters right in front of Joy and Sadness.
Did neither of them work out that if they did the same thing with the core memories, that it would send them to Headquarters as well?
Granted, it wouldn't get Joy and Sadness back up there, but it would at least allow the remaining personality islands and by extension, Riley to function somewhat normally until they managed to find their way back as well.
Now that the Girl Alert guy has a name (Jordan), his name is actually mentioned during the screen-in-screen material during the credits.
The teacher calls on him during her segment.